Gravel Calculator

Who Uses a Gravel Calculator and Why

A gravel calculator is used by anyone who needs to fill an area with loose stone and does not want to guess the amount. Homeowners reach for it when laying a driveway, building a garden path, filling a French drain, or spreading a base under a shed or patio. Getting the quantity right on the first order saves a return trip to the yard and a second delivery charge.

Contractors, landscapers and drainage crews use it every day to quote jobs and load trucks. Because gravel is sold by the cubic yard or by the ton, a foreman needs both numbers to compare a bulk-bag price against a loose-load price. This tool gives cubic yards, tons and cubic feet from one set of measurements, so the estimate matches whatever unit the supplier prices in.

Common Projects and the Depth They Need

• Gravel driveway: Usually 4 to 6 inches of crushed stone over a compacted base, often built up in two layers for strength.
• Garden or walking path: Around 2 to 3 inches of pea gravel or fine stone is enough for foot traffic and looks tidy.
• Drainage trench or French drain: Filled with clean stone to the depth of the trench, so measure the true trench depth rather than a surface layer.
• Shed or patio base: A 3 to 4 inch layer of compacted stone gives a level, well-drained footing under paving or a slab.
• Ground cover and beds: A 2 inch decorative layer over landscape fabric controls weeds while keeping the stone cost down.

How Gravel Volume Is Calculated

The math is straightforward once every measurement is in the same unit. First the length and width are multiplied to get the area in square feet. That area is multiplied by the depth in feet, which is why a depth entered in inches is divided by twelve first. The result is the volume in cubic feet. Dividing cubic feet by twenty seven converts to cubic yards, the unit most suppliers use, and multiplying cubic yards by about 1.4 estimates the weight in US tons.

The tool also adds your waste margin on top, since spread gravel settles into ruts, spills at the edges, and never fills a space perfectly. Keep in mind that the 1.4 tons per cubic yard figure is an average; wet stone, fine crushed rock and dense aggregates weigh more, so always confirm the exact density and coverage with your supplier before you place the final order.

Gravel Coverage by Depth

Common Mistakes and Tips

The most frequent error is mixing units without converting, such as entering length in feet but depth in inches as if it were feet. That mistake makes the order twelve times too big or too small, which is why this calculator keeps a unit dropdown on every field. Another common slip is ordering the exact calculated amount with no waste margin, then coming up short once the stone settles and spreads.

For odd shapes, split the area into rectangles, calculate each one, and add the results. It also helps to price the same job by cubic yard and by ton, because bulk pricing sometimes favors one unit. To plan the rest of a project, pair this with our concrete calculator for footings and slabs, our sand calculator for a leveling layer, and the topsoil calculator for finishing beds.

People Also Ask

How much gravel do I need for a 20 by 10 driveway at 3 inches deep?

A 20 by 10 foot area at 3 inches deep is 50 cubic feet, which is about 1.85 cubic yards or roughly 2.6 US tons before any waste. Adding a 10 percent margin brings it to close to 2 cubic yards, so order about 2 yards.

How do I convert cubic yards of gravel to tons?

Multiply the cubic yards by about 1.4 to estimate US tons, since gravel weighs roughly 1.4 tons per cubic yard. Denser or wet stone weighs more, so ask your supplier for the exact conversion for the product you are buying.

How deep should gravel be for a driveway?

A gravel driveway is usually 4 to 6 inches deep, often installed in two layers with a coarser base and a finer top. Lighter foot paths and decorative areas only need 2 to 3 inches of stone.

How much does a cubic yard of gravel weigh?

A cubic yard of typical dry gravel weighs about 2,800 pounds, or roughly 1.4 US tons. Wet gravel and dense crushed stone can weigh more, so treat the figure as an average.

How much area does a ton of gravel cover?

One ton of gravel covers about 77 square feet at 3 inches deep, or about 116 square feet at 2 inches deep. Coverage falls as the layer gets thicker, which the coverage table above lays out by depth.

Why should I add a waste margin?

Gravel settles into low spots, spills at the edges, and compacts under traffic, so the space needs slightly more than the raw volume. A margin of 5 to 10 percent is common and helps you avoid running short mid-job.

Can I use this calculator for pea gravel or crushed stone?

Yes. The volume math is identical for any loose stone. The weight uses an average density of 1.4 tons per cubic yard, so adjust the tonnage if your supplier lists a different weight for pea gravel, crushed stone or river rock.

Is gravel sold by the yard or by the ton?

Both are common. Landscape yards often sell by the cubic yard, while quarries and bulk haulers often sell by the ton. This tool shows both figures so you can compare prices in whichever unit the seller uses.